3239
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3360
- Proper Divisor Sum (Aliquot Sum)
- 121
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 3120
- Möbius Function
- 1
- Radical
- 3239
- Omega Function (Ω)
- 2
- Little Omega Function (ω)
- 2
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 123
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- Squarefree Number
- yes
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- a(n) = n*(2*n-3).at n=41A014107
- a(n) = prime(n)*(prime(n+1)-1)/2.at n=21A014303
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 55.at n=18A031553
- Concatenation of n and n+7.at n=31A032612
- a(n) = (2*n+1) * (4*n-1).at n=20A033566
- Number of partitions of n into parts 5k+1 or 5k+2.at n=52A035371
- Coordination sequence T3 for Zeolite Code AWO.at n=39A038405
- Coordination sequence T2 for Zeolite Code AWO.at n=39A038407
- Numbers k such that the string 8,8 occurs in the base 9 representation of k but not of k-1.at n=39A044331
- Numbers n such that string 3,9 occurs in the base 10 representation of n but not of n-1.at n=35A044371
- Numbers n such that string 2,3 occurs in the base 10 representation of n but not of n+1.at n=36A044736
- Numbers n such that string 3,9 occurs in the base 10 representation of n but not of n+1.at n=35A044752
- Number of colors that can be mixed with n >= 0 units of yellow, blue, red.at n=27A048241
- a(n) = Sum_{k=1..n} T(n,k), array T as in A049840.at n=42A049841
- Smallest value of x such that M(x) = n, where M() is Mertens's function A002321.at n=16A051400
- Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 20.at n=24A051985
- Composite n such that sigma(n)-phi(n) divides sigma(n)+phi(n).at n=31A061367
- Smallest semiprime p*q such that q >= p and q mod p = n.at n=38A064910
- Numbers n such that phi(phi(n)) = phi(sigma(n)) where phi is Euler's totient and sigma is the multiplicative sum-of-divisors function.at n=30A065555
- Smallest solution m to (n+1)*phi(m) = n*sigma(m), or -1 if no solution exists.at n=12A065824